E+H Deltapilot FMB51 Hydrostatic Level Transmitter

Precision Hydrostatic Level Measurement with Endress+Hauser Deltapilot FMB51

The Endress+Hauser Deltapilot FMB51 is a high-performance hydrostatic level transmitter designed for continuous level, volume, and density measurement of process liquids, environmental water, pastes, and viscous slurries. Built for demanding installations in deep reservoirs, tall storage tanks, underground sumps, and hygienic process vessels, the FMB51 combines heavy-duty mechanical engineering with advanced digital signal processing to maintain uncompromising measurement stability.

Patented Climate-Proof Contite Measuring Cell Technology

Hydrostatic level sensors operating in outdoor, humid, or washdown environments frequently suffer from internal condensation caused by severe ambient temperature shifts. The Deltapilot FMB51 solves this challenge through Endress+Hauser’s patented Contite measuring cell. The sensor element is hermetically sealed and protected against moisture ingress, vapor, and harsh cleaning cycles. This unique climate-proof construction guarantees zero drift, exceptional long-term signal stability, and immunity to rapid thermal shock during clean-in-place (CIP/SIP) procedures or changing weather conditions.

Key Features & Technical Advantages

• Patented Contite Cell: Completely climate-proof and hermetically sealed against condensation, ambient humidity, and thermal shock.

• Flexible Cable & Rigid Rod Extensions: Available with heavy-duty extension cables for deep sumps and wells, or rigid extension rods for agitated vessels and top-mounted tanks.

• Corrosion-Resistant Diaphragms: High-grade 316L, Hastelloy C, or Alloy materials provide broad chemical compatibility against aggressive acids, alkalis, and saline fluids.

• High-Precision Signal Processing: Delivers high accuracy up to ±0.1% or ±0.075% of set span, providing precise inventory tracking and volume calculations.

• Multiple Output & Digital Protocols: Supports 4–20 mA HART, PROFIBUS PA, and FOUNDATION Fieldbus communication protocols for seamless integration into plant Distributed Control Systems (DCS) and PLCs.

• Hygienic & Hazardous Area Certifications: Complies with 3-A, EHEDG, FDA, and international explosion-proof standards (ATEX, FM, CSA, IECEx) for safe operation in hazardous gas and sanitary environments.

Advanced Overpressure & Thermal Resistance

The Deltapilot FMB51 is built to handle severe process surges. Its robust measuring cell design features high overload resistance up to several times the nominal pressure rating, protecting the internal cell from water hammer, agitation forces, or pressure spikes in closed process systems.

Applications 

• Water & Wastewater Engineering: Level measurement in deep wells, water towers, pumping stations, storm retention basins, and sewage digesters.

• Chemical & Petrochemical Industry: Storage tanks for acids, alkalis, solvents, liquid additives, and hazardous chemical basins.

• Food & Beverage Processing: Milk silos, syrup storage tanks, juice pasteurization lines, and mixing tanks requiring CIP/SIP cleanability.

• Pharmaceutical & Fine Chemicals: Purified water storage, liquid media tanks, and sterile process vessels.

• Mining & Minerals: Slurry holding tanks, thickener basins, and drainage sumps.

 Technical Specifications

Parameter / Feature	Specification Details
Measuring Principle	Hydrostatic level measurement
Measuring Cell Type	Climate-proof Contite measuring cell
Measuring Ranges	0 to 100 mbar up to 0 to 10 bar (0 to 1 mH2O up to 0 to 100 mH2O)
Measurement Accuracy	Standard: ±0.1% | Platinum version: ±0.075% of set span
Process Temperature	-10 °C to +100 °C (+14 °F to +212 °F) (Higher options available)
Process Pressure (Abs.)	Vacuum up to 10 bar (145 psi) (Overpressure limit up to 40 bar)
Sensor Extensions	Extension Cable (PE/PUR/FEP) or Extension Rod (316L)
Wetted Materials	316L, Hastelloy C, PE, PUR, FEP
Output / Protocol	4–20 mA HART, PROFIBUS PA, FOUNDATION Fieldbus
Process Connections	Threaded (G, NPT), Flanged (ASME, EN, JIS), Sanitary connections
Ingress Protection	IP66 / IP68 (NEMA 4X / 6P)
Approvals / Certifications	ATEX, FM, CSA, IECEx, 3-A, EHEDG, FDA, SIL2/SIL3

FAQ

Q1: What makes the Contite measuring cell inside the Deltapilot FMB51 special?

Answer: The Contite cell is hermetically sealed against atmospheric moisture, making it climate-proof and immune to internal condensation errors that typically affect hydrostatic level sensors in humid or outdoor settings.

Q2: Can the Deltapilot FMB51 be used in deep wells or underground sumps?

Answer: Yes, the FMB51 can be configured with flexible extension cables (in PUR, PE, or FEP materials) supporting measuring depths up to 100 meters.

Q3: Is the Deltapilot FMB51 suitable for food and beverage tanks requiring CIP/SIP?

Answer: Yes, the FMB51 is available with hygienic process connections and 3-A / EHEDG compliance, engineered to withstand high-temperature CIP/SIP cleaning cycles up to 100 °C.

Q4: What digital communication protocols does the FMB51 support?

Answer: The FMB51 supports 4–20 mA HART, PROFIBUS PA, and FOUNDATION Fieldbus for direct integration into PLC and DCS automation networks.

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